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Reports singleton classes.
<p>Singleton classes are declared in a way that only one instance of the class can ever be instantiated. Singleton classes complicate testing,
  and their presence may indicate a lack of object-oriented design.</p>
<p><b>Example:</b></p>
<pre><code>
  class Singleton {
    private static final Singleton ourInstance = new Singleton();

    private Singleton() {
    }

    public Singleton getInstance() {
        return ourInstance;
    }
  }
</code></pre>
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